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FR2802696B1 - MAGNETO OPTICAL READER OPTIMIZED BY THE INCIDENT LIGHT POLARIZER - Google Patents

MAGNETO OPTICAL READER OPTIMIZED BY THE INCIDENT LIGHT POLARIZER

Info

Publication number
FR2802696B1
FR2802696B1 FR9915987A FR9915987A FR2802696B1 FR 2802696 B1 FR2802696 B1 FR 2802696B1 FR 9915987 A FR9915987 A FR 9915987A FR 9915987 A FR9915987 A FR 9915987A FR 2802696 B1 FR2802696 B1 FR 2802696B1
Authority
FR
France
Prior art keywords
incident light
optical reader
magneto optical
light polarizer
optimized
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
FR9915987A
Other languages
French (fr)
Other versions
FR2802696A1 (en
Inventor
Jean Claude Jacquet
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Thales SA
Original Assignee
Thomson CSF SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Thomson CSF SA filed Critical Thomson CSF SA
Priority to FR9915987A priority Critical patent/FR2802696B1/en
Priority to US10/149,788 priority patent/US6944102B2/en
Priority to PCT/FR2000/003485 priority patent/WO2001045099A1/en
Priority to AU28551/01A priority patent/AU2855101A/en
Publication of FR2802696A1 publication Critical patent/FR2802696A1/en
Priority to NO20022907A priority patent/NO20022907L/en
Application granted granted Critical
Publication of FR2802696B1 publication Critical patent/FR2802696B1/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1362—Mirrors
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/10532—Heads
    • G11B11/10541—Heads for reproducing
    • G11B11/10543—Heads for reproducing using optical beam of radiation
    • G11B11/10547—Heads for reproducing using optical beam of radiation interacting with the magnetisation of an intermediate transfer element, e.g. magnetic film, included in the head
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1365—Separate or integrated refractive elements, e.g. wave plates
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/10532—Heads
    • G11B11/10541—Heads for reproducing
    • G11B11/10543—Heads for reproducing using optical beam of radiation
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0908—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for focusing only

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
FR9915987A 1999-12-17 1999-12-17 MAGNETO OPTICAL READER OPTIMIZED BY THE INCIDENT LIGHT POLARIZER Expired - Fee Related FR2802696B1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
FR9915987A FR2802696B1 (en) 1999-12-17 1999-12-17 MAGNETO OPTICAL READER OPTIMIZED BY THE INCIDENT LIGHT POLARIZER
US10/149,788 US6944102B2 (en) 1999-12-17 2000-12-12 Magneto-optical reader which is optimized by the incident-light polariser
PCT/FR2000/003485 WO2001045099A1 (en) 1999-12-17 2000-12-12 Magneto-optical reader which is optimized by the incident-light polariser
AU28551/01A AU2855101A (en) 1999-12-17 2000-12-12 Magneto-optical reader which is optimized by the incident-light polariser
NO20022907A NO20022907L (en) 1999-12-17 2002-06-17 Magneto-optic reader optimized with light polarization

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR9915987A FR2802696B1 (en) 1999-12-17 1999-12-17 MAGNETO OPTICAL READER OPTIMIZED BY THE INCIDENT LIGHT POLARIZER

Publications (2)

Publication Number Publication Date
FR2802696A1 FR2802696A1 (en) 2001-06-22
FR2802696B1 true FR2802696B1 (en) 2002-07-19

Family

ID=9553416

Family Applications (1)

Application Number Title Priority Date Filing Date
FR9915987A Expired - Fee Related FR2802696B1 (en) 1999-12-17 1999-12-17 MAGNETO OPTICAL READER OPTIMIZED BY THE INCIDENT LIGHT POLARIZER

Country Status (5)

Country Link
US (1) US6944102B2 (en)
AU (1) AU2855101A (en)
FR (1) FR2802696B1 (en)
NO (1) NO20022907L (en)
WO (1) WO2001045099A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SG121900A1 (en) * 2004-10-08 2006-05-26 Olympus Technologies Singapore An optical receiving device

Family Cites Families (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3636535A (en) * 1969-12-10 1972-01-18 Magnavox Co Magneto-optical transducer
JPS5459915A (en) * 1977-10-20 1979-05-15 Sony Corp Method and apparatus for reading of magnetic recording signal
NL8203725A (en) * 1982-09-27 1984-04-16 Philips Nv THERMO-MAGNETO-OPTICAL MEMORY DEVICE AND RECORD MEDIUM FOR THAT.
EP0156058A3 (en) * 1983-08-06 1986-01-29 Brother Kogyo Kabushiki Kaisha Magneto-optical reading apparatus
US4654837A (en) * 1985-09-06 1987-03-31 Datatape Incorporated Magneto-optic transducer with enhanced signal performance
US4918675A (en) * 1986-12-04 1990-04-17 Pencom International Corporation Magneto-optical head with separate optical paths for error and data detection
CN1043203A (en) * 1988-12-02 1990-06-20 三井石油化学工业株式会社 Light output control method and device thereof
JP2786484B2 (en) * 1989-01-25 1998-08-13 オリンパス光学工業株式会社 Magneto-optical reproducing device
JP2706128B2 (en) * 1989-02-28 1998-01-28 オリンパス光学工業株式会社 Magneto-optical reproducing device
FR2657190B1 (en) * 1990-01-18 1995-07-21 Thomson Csf DEVICE FOR READING OBLONG SEGMENTS OF A SCROLLING SUPPORT.
JP2798185B2 (en) * 1990-07-26 1998-09-17 キヤノン株式会社 Optical head for magneto-optical information reproducing device
JPH04301245A (en) * 1991-03-28 1992-10-23 Canon Inc Magneto-optical recording and reproducing optical head
US5282188A (en) * 1992-02-18 1994-01-25 Eastman Kodak Company Apparatus and method for optimizing performance in read/write head of an optical storage system with a magneto-optical storage medium
FR2696037B1 (en) * 1992-09-18 1994-11-04 Thomson Csf Magnetic reading device.
FR2699724B1 (en) * 1992-12-22 1995-01-20 Thomson Csf Method for reading a recording medium and system applying this method.
FR2701332B1 (en) * 1993-02-09 1995-03-10 Thomson Csf Magneto-optical read head and apparatus for reading multitrack magnetic recordings.
FR2726960B1 (en) 1994-11-10 1996-12-13 Thomson Csf PROCESS FOR PRODUCING MAGNETORESISTIVE TRANSDUCERS
US5586101A (en) * 1995-03-01 1996-12-17 Eastman Kodak Company Magneto-optic data storage system with differential detection channels having separate gain control circuit
JP3670720B2 (en) * 1995-07-25 2005-07-13 ペンタックス株式会社 Manufacturing method of information reading device
US6538968B1 (en) * 1996-10-08 2003-03-25 Sanyo Electric Co, Ltd. Information recording/reproducing apparatus

Also Published As

Publication number Publication date
AU2855101A (en) 2001-06-25
NO20022907D0 (en) 2002-06-17
US6944102B2 (en) 2005-09-13
WO2001045099A1 (en) 2001-06-21
US20040042700A1 (en) 2004-03-04
FR2802696A1 (en) 2001-06-22
NO20022907L (en) 2002-08-07

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Legal Events

Date Code Title Description
CD Change of name or company name
CA Change of address
TP Transmission of property
ST Notification of lapse

Effective date: 20140829